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Current Costs of Geothermal Power Generation in New Zealand

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Current Costs of Geothermal Power Generation in New Zealand ( current-costs-geothermal-power-generation-new-zealand )

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Assessment of the Costs of Geothermal Power Generation in New Zealand sometimes water if adequate water supplies are available. Because of this indirect heat rejection, none of the geothermal fluid is evaporated. This means that all of the geothermal fluid must be disposed of, either to surface streams or (almost always because of environmental considerations, and often because there may be a positive reservoir pressure enhancement by so doing) by reinjection into the geothermal reservoir. However, this also means that additional reinjection wells may be required, so both the cost of these wells and the potential longevity of the resource (and reduction in make-up production well requirements) should be considered in any comprehensive resource-wide economic assessment. During the early stages of reservoir exploitation the geothermal reservoir is generally not able to be modelled to a degree of accuracy that will give certainty as to whether enhanced reinjection will be to the benefit or the detriment of the resource. For the purpose of this study the additional well requirements associated with reinjection of that part of any steam condensate which is not evaporated in a cooling system and discharged to atmosphere will not be included in any comparison between power plant options. However, the cost of any such additional wells will be added to the capital cost of the power plant cycle subsequently selected from the comparison. Figure B-4 Binary cycle (organic Rankine cycle) power plant, using both steam and separated geothermal brine Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 75

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